Added gtest CHECK symbol to benchmark test

test/CMakeLists.txt

@@ -2,7 +2,8 @@ find_package(Threads REQUIRED)
 
 # Demonstration executable
 add_executable(benchmark_test benchmark_test.cc)
-target_link_libraries(benchmark_test benchmark ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries(benchmark_test benchmark gtest ${CMAKE_THREAD_LIBS_INIT})
+add_dependencies(benchmark_test googletest)
 add_test(benchmark benchmark_test 50)
 add_test(benchmark_filter_simple benchmark_test --benchmark_filter=Calculate 16)
 add_test(benchmark_filter_prefix benchmark_test --benchmark_filter=*Calculate 0)

test/benchmark_test.cc

@@ -14,6 +14,8 @@
 #include <string>
 #include <vector>
 
+#include <gtest/gtest.h>
+
 namespace {
 
 #ifdef DEBUG